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參數(shù)資料
| 型號： | WE512K8-250CQA |
| 廠商： | WHITE ELECTRONIC DESIGNS CORP |
| 元件分類： | PROM |
| 英文描述： | 512K X 8 EEPROM 5V MODULE, 250 ns, CDIP32 |
| 封裝： | HERMETIC SEALED, SINGLE CAVITY, SIDE BRAZED, CERAMIC, DIP-32 |
| 文件頁數(shù)： | 3/13頁 |
| 文件大?。?/td> | 678K |
| 代理商： | WE512K8-250CQA |
WE512K8, WE256K8,
WE128K8-XCX
11
White Electronic Designs Corporation (602) 437-1520 www.whiteedc.com
White Electronic Designs
March 2007
Rev. 2
White Electronic Designs Corp. reserves the right to change products or specications without notice.
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 80
TO
ADDRESS 5555
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA 55
TO
ADDRESS 2AAA
LOAD DATA 20
TO
ADDRESS 5555
LOAD DATA XX
TO
ANY ADDRESS(4)
LOAD LAST BYTE
TO
LAST ADDRESS
(1)
FIGURE 11 –
SOFTWARE BLOCK DATA
PROTECTION DISABLE ALGORITHM
SOFTWARE DATA PROTECTION
A software write protection feature may be enabled
or disabled by the user. When shipped by White
Microelectronics, the devices have the feature disabled.
Write access to the device is unrestricted.
To enable software write protection, the user writes three
access code bytes to three special internal locations.
Once write protection has been enabled, each write to the
EEPROM must use the same three byte write sequence
to permit writing. After setting software data protection,
any attempt to write to the device without the three-byte
command sequence will start the internal write timers. No
data will be written to the device, however, for the duration
of tWC. The write protection feature can be disabled by
a six byte write sequence of specic data to specic
locations. Power transitions will not reset the software
write protection.
Each 32K byte block (128K bytes for the WE512K8)
of EEPROM has independent write protection. One or
more blocks may be enabled and the rest disabled in any
combination. The software write protection guards against
inadvertent writes during power transitions or unauthorized
modification using a PROM programmer. The block
selection is controlled by the upper most address lines
(A17 through A18 for the WE512K8, A15 through A17 for the
WE256K8, or A15 and A16 for the WE128K8).
HARDWARE DATA PROTECTION
Several methods of hardware data protection have been
implemented in the White Microelectronics EEPROM.
These are included to improve reliability during normal
operations.
a)
VCC power on delay
As VCC climbs past 3.8V typical the device will wait
5mSec typical before allowing write cycles.
b)
VCC sense
While below 3.8V typical write cycles are inhibited.
c)
Write inhibiting
Holding OE# low and either CS# or WE# high
inhibits write cycles.
d)
Noise lter
Pulses of <8ns (typ) on WE# or CS# will not initiate
a write cycle.
NOTES:
1. Data Format: I/O7-0 (Hex);
Address Format: A14 -A0 (Hex).
A17 and A18 control selection of one of four blocks in the 512Kx8.
A15, A16, and A17 control selection of one of 8 pages in the 256Kx8.
A15 and A16 control one of the four blocks in the 128Kx8.
2. Write Protect state will be activated at end of write even if no other data is
loaded.
3. Write Protect state will be deactivated at end of write period even if no other
data is loaded.
4. 1 to 128 bytes of data at each of 4 blocks may be loaded in the 512Kx8.
1 to 64 bytes of data at each of 8 blocks may be loaded in the 256Kx8 and
1 to 64 bytes on 4 blocks in the 128Kx8.
EXIT DATA
PROTECT STATE(3)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| WE512K8-300CC | 制造商:Microsemi Corporation 功能描述:512K X 8 EEPROM MODULE, 300NS, 32 DIP, COMMERCIAL SCREENED - Bulk |
| WE512K8-300CCA | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:512Kx8 CMOS EEPROM, WE512K8-XCX, SMD 5962-93091 |
| WE512K8-300CI | 制造商:Microsemi Corporation 功能描述:512K X 8 EEPROM MODULE, 300NS, 32 DIP, INDUSTRIAL SCREENED - Bulk |
| WE512K8-300CIA | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:512Kx8 CMOS EEPROM, WE512K8-XCX, SMD 5962-93091 |
| WE512K8-300CM | 制造商:Microsemi Corporation 功能描述:512K X 8 EEPROM MODULE, 300NS, 32 DIP, MIL-SCREENED - Bulk |
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